Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f116a2f0eda394…

MALICIOUS

PDF

85.6 KB Created: 2021-07-02 20:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58061d7eabc011a63b923a9d41a0667d SHA-1: ff69498337f69953973b24fecbf29ca32934e1f1 SHA-256: b9f116a2f0eda394376bafdb23137bb0e4ce2ff41a1c29a81353c6feced1e6c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=python+add+column+to+dataframe+with+value
    • http://jkbprivateiti.com/userfiles/file/64137563546.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1fc21538a3---wopavotekojerotop.pdf
    • http://hydrogears.com/survey/userfiles/files/61427041130.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609863457e7a7---kuponefelebi.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160890dc83816a---95600952856.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b97e161d9---sowixanufatat.pdf
    • http://esejsc.com/upload/files/nozipiwutobasefuvak.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/4b017c4549c12a36d4296fa4a79c9b84/fifabimetisita.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/3c27d9d746ec6808d022acfa5ca92778/52622502587.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/84177000166.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/507166dbn98ld9j50mf9k5mqgg/62946647166.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b85dd0910e---17580572733.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/d130065871f6b912b685cfde3f9167f5/67831077661.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105011037097051.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160943c837136f---39248247489.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608586b11bd53---21160297081.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aa61efe0e5e---zikukolimetefuvusazaxeba.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a908cbf3273---91081399644.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090ce2490840---lofan.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083ca76cb291---80653215069.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/oom61n1p28kd3pum668kevl31o/87753029230.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/runonegetiju.pdf
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080c26969aea---subazu.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/234ef4b4b0c1ca0d9a808eba0cc7e1ac/fubexelomila.pdf
    • http://universalestetic.com/userfiles/file/finomosilis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e99e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 16792 bytes
font_01_sfnt_off000101b5.bin
1a09f1f03e6a8e33ba2f72819e239f8b87a594336a710896626326176859c85e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 10940 bytes
font_02_sfnt_off00011aeb.bin
c71ef9ecb5bc9619360f6ae848b8ce7e780818cf9b11a8f828f7107134ae3a49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEB 17364 bytes

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